Automatic damper regulator



Aug., 3L w25; W'. D. DFQESKE AUTMTI C DAMPER REGULATOR Filed April 7.i923 2 iheeiiss-5i1ef l h i N W. D. DREISKE Aug. 3l 1926.

AUTOMATIC DAMPER REGULATOR Filed April 7, 1923 2 Sheets-Sheet 2 CilPatented Aug. 31, 1926.

PATENT OFFICE.

WLLTAM D. DREISKE, OF OAK PARK, LLINOIS.

AUTOMATIC DAMPER REGULATOR.

Application led April 7, 1923.

This invention relates to damped regulators, and more particularly toregulators of that kind in which a compensating mechanism is providedwhereby the damper, in the automatic control thereof, is not alwayseither entirely closed or entirely open, but to the contrary is, byreason of the compensating mechanism, some times only partially open,thereby tending to maintain or ensure a proper air supply for theparticular load under which the boiler may be operating at anyparticular time, instead of merely providing either the maximum or theminimum draft foi the fire in the furnace.

Generally stated, therefore, the object of the invention is to provide,in addition to the ordinary compensating mechanism, an auX- iliarycompensating device which will still further govern the action of thesteam pressure controlled damper regulator, thereby to ensure still moreaccurately the proper draft or air supply for any particular load underwhich the boiler may be operating and tending to ensure closerregulation of the temperaturey necessary for the boiler under allconditions of load, or under changing loads, as will hereinafter morefully appear.

It is also an object to provide certain details and features ofconstruction and combinations tending to increase the general eiciencyand the desirability of a damper regulator compensating mechanism ofthis particular character.

To these and other useful ends the invention consists in matters.hereinafter set forth and claimed, and shown in the accompanyingdrawings, in which Figure 1 is a side elevation of a Adamper regulatorapparatus embodying the principles of the invention, showing thecondition of the parts when the piston in the cyliuder is down.

Figure 2 is a simliar view, with the lower portion thereof broken awayfor convenience of illustration, showing the positions of the parts whenthe piston is in its raised position.

Figure 3 is a similar view showing the piston raised a distance from theposition shown in Figure l.

Figure 4 is a horizontal section on line '-i--ll in Figure 2.

Figure 5 is an enlarged detail section on line 5-5 in Figure 2.

Figure 6 is an enlarged front View of the Serial No. 630,447.

auxiliary compensating device shown in said other views.

Figure 7 is a side elevation of the device shown in Figure 6.

Figure 8 is a diagram of the damper regulating aparatus, showing thesame connected to the damper of a boiler furnace.

As thus illustrated, the invention comprises a cylinder 1 with a piston2'therein, and with a lever 3 pivoted or fulcrumed at el; below thebottom of said cylinder. Said lever has a weight 5 which is adjustablethereon. Below said lever, and below said cylinder, is a diaphragm 6provided with a knife edge 7 upon which said lever is supported. Aclosed compartment 8 is formed below said diaphragm, with a pipe 9leading` thereto, so that pressure in said compartment 8 will raise thelever 3 in a manner that will be readily understood; whereas, with thecessation of pressure in the chamber 8, said lever 3 will move downward.Said piston is operated, preferably, by hydraulic pressure, and for thispurpose a valve mechanism is provided' comprising a casii'xg` 10 havinga spool-shaped valve 11 therein to control the ports 12 and 13 which areconnected by pipes 14 and 15, respectively, with the lower and upperends of the cylinder 1, in the manner shown. The spool-shaped valve 11is connected by a rod 16 with the lever 17, which latter is fulcrumed at18 on the bell crank lever 19, the latter being fulcrumed at 20 on astationary portion of the cylinder structure. A rod 21 connects theliever 3 with the end of the lever 17, so that the latter is operatedwhen the lever is moved up or down. A water pressure supply pipe 22leads into the side of the valve casing 10, opposite the middle portionof the spool-shaped valve 11, so that'the inlet port 23 may be connectedwith either the port 12 or the port 13, by the space provided betweenthe two ends of the valve. Exhaust pipes 24- and 25 lead from the endsofthe valve casing, so that while hydraulic pressure is entering one endof the cylinder the water may be allowed to flow out of the other endthereof, in a manner that will be readily understood. Of course, anysuitable fluid pressure may be employed for operating the piston 2 inthe cylinder.

Now the ordinary compensating mechanism comprises a tapered bar 26rigidly conlll) nected at its upper end by an arm 27 to the upper endportion of the piston rod 28 oit said piston. The bell crank 19 has aroller 29 which ordinarily engages the inclined edge 30 of the barBG, sothat as this aar moves upward the tulcrum point 18 will move downwardand vice versa when the bar moves downward the ulcrum point "LS willmove upward, and this sort otI adjustment tends, to change the `mannerin which the valve mechanism controls `the admission of tluid pressureto the cylinder to operate the piston. The bell crank 19, it will heseen. is subject to .pressure ot' a spring 31 which tends to press theroller 29 toward the bar 26, but which yields to permit tlieeompensatingaction explained.

vllowin accordance with the vinvention a short bar whiclris wedge shapedor` tapered troni its lower end to its upper end, asshown in Figures 6`and 7, is employed, said bar 3Q thus termed. being interposed between'the roller 29 and the edge 30 ot the bai-..26 previously mentioned. Theinclined edge 33 has a shoulder 311 above and a shoulder 35 lbelow tolimitl the travel oil the roller 29 thereon. Hence, when the bar 26moves upward the" friction carries the bar 32 upward until the roller 29strikes the shoulder 35, and then the bar 25 slides upward in the groove36 formed in baclt ot the bar l32, until the limit ot upward movement isreached. ln a similar manner, when the bar 25 moves downward, the bar 32will move with it untilIl the shoulder 34 strikes the roller 29, whenthe bar 32 will then remain stationary and the bar 26 will slidedownward. pThus, and whether the piston moves upward or downward, ithas,or may have, at first a maximum or accelerated control over thefulcrunipoint 18, until the limit of the movement ot' the bar 33 is reached,.andthereafter any further movement of the fulcrunipoint 18 will be slower,inasmuch as the angle ot the edge 30 is much less than the angle ot theedge 33, with the result that the damperv regulator will come closer toeffecting such a control over the damper as will insure propertemperature ott the lire for any given load, than would be the case ifthe roller 29 were allowed to directly engage the edge 30 of thecompensating bar 26, which latter slides up and down in the lined or.stationary vertical gulde 37 mounted on the sidev of the cylinder.

Of course, without the bar 2G, and without any compensating mechanismwhatever, the damper would at all times be entirely open or completelyclosed ateachchange of steam 4Vpressure in the boiler. This would.rovide er: essive variation in the draft which would increase theconsumption oi coal. il compensating attachment is theretore provided,which operates in the manner shown, causing the regulator to come torest and remain so until a slight change in pressure occurs, and theoperation is again repeated. In addition, as explained, the auxiliarycompensating device 32 is employed, which insures 'further accuracy anda greater closeness ot regulation of the turnace damper 38 necessary toinsure a proper air supply for whatever load the boiler may be operatingunder at any particular time. Vlt will be seen that, :tor the purpose ofautomatic control, said damper is connected by a chain or other flexibleconnection 39 with the upper end ot the piston rod 2S, so that the upand down movement ot this rod controls the damper in the desired manner.lt will be understood, furthermore, that this damper is in the stack l0of the boiler furnace, rso that it controls the draft and `he air supplytor the furnace below the boiler. rihus said damper is subject toautomatic control by the variation of the pressure in the boiler itself,communicated to the chamber 8 by the steam pipe 9 leading from theboiler. Ot course, any suitable iiuid pressure may be used, but theatomatic damper regulator is subject to con rol by the variation inpressure of the steam in the boiler.

ylfhue the main compensating` device 30 co-operates with the secondaryor auxiliary compensating device 32, as explained, to automaticallygovern the action of the regulator, in the manner explained. One coinpenating device,vtheretore, acts through the other to automatically controlthe regulator, or to govern the regulator, in accordance with variationsin the boiler pressure, thereby to automatically control the damper orother iiistrumentalities, by the piston 2 or other actuator.

lllhat l claim as my invention is 1. ln an automatic damper regulatorfor boiler furnaces, subject to control by the variation. or the boilerpressure, the combination of a piston, a damper controlled by saidpiston, valve mechanism to control Huid pressure tol operate saidpiston, means controlled by the boiler pressure to control said valvemechanism, a main compensating device to govern the action ot said valvemechanism, and an auxiliary compensating` device acting conjointly withsaid main compensating device to control the action ot said damperregulator.

ri structure as specified in claim l, said .main compensating devicecomprising a relatively long tapered bar, a 'tulcrum member havingengaging means, and said auxiliary .compensating device comprising ashorter bar inserted like a wedge between said iirst mentionedj bar andvsaid engaging means, said shorter bar having the greater angle.

KK `3. A structure as specified in claim 1, said main compensatingdevice comprising a relatively long tapered bar, a tule-rum memberprovided with means tending to engage the angular edge of said bar, andsaid auxiliary compensating device comprising a sliding memberinterposed between said bar and said engaging means.

4L. A structure as specified in claim l, said main compensating devicecomprising a relatively long tapered bar, a ulcrum member having meansto engage the angular edge ot said bar, said bar being movable up anddown by the action ot said piston, and said auxiliary compensatingdevice comprising a relatively short tapered bar inserted like a wedgebetween said relatively long bar and said engaging means, saidrelatively short bar having means to limit the up and down movementthereof, whereby the up and down movement of said auxiliarycompensating` device is less than the up and down movement of saidrelatively long bar.

5. A structure as specified in claim l, said main compensating devicecomprising a movable member and instrumentalities subject to control bymovement of said member to govern the action of said valve mechanism,and said auxiliary device comprising means interposed to change theeii'ect of the movement of said member, so that the main compensatingdevice and the auxiliary compensating device co-operate to produce aresult dilierent from that which the main compensating' device would becapable oitl producing alone.

G. ln a regulator, in combination with means to be controlled thereby,the combination oi a primary compensating device, and a secondarycompensating device, each dependent on the other, the one device actingconjointly with and through the other device to automatically govern theaction of said regulator, whereby to automatically regulate saio meansto be controlled in the desired manner.

7. A structure as speciiied in claim 6, said primary compensating devicecomprising a vertically disposed bar having an inclined edge, and saidsecondary compensating device comprising a shorter bar sliding on saidinclined edge, together with means to engage the secondary compensatingdevice.

8. A structure as specilied in claim 6, said -primary compensatingdevice comprising a member of suitable length, means whereby said memberis movable endwise, and said secondary compensating device comprising amember' which is slidable upon and longitudinally of said other member',together with means having traveling engagement with one edge of saidsecondary compensating device.

9. A regulator and means controlled thereby, having primary andsecondary compensating devices, acting conjointly and one through theother to automatically govern the action ot said regulator, whereby togovern said means to be controlled, substantially as described.

10. ln an automatic regulator for boiler furnaces, subject to control bythe variation of the boiler pressure, the combination of an actuator,instrumentalities controlled by said actuator, mechanism to control saidactuator, means controlled by the boiler pres'- sure to control saidmechanism, a main compensating device to govern the action of saidmechanism, and an auxiliary compensating device acting conjointly withsaid main compensating device to control the action of said regulator.

ll. A structure as specilied in claim l0, said main compensating devicecomprising a relatively long tapered bar, a fulcrum member havingengaging means, and said auxiliary compensating device comprising ashorter bar inserted like a wedge between said first mentioned bar andsaid engaging means, said shorter bar having the greater angle.

l2. A structure as specified in claim l0, said main compensating devicecomprising a relatively long tapered bar, a ulcrum member provided withmeans tending to engage the angular edge ot said bar, and said auxiliarycompensating device comprising a sliding member interposed between saidbar and said engaging means.

13. A structure as specitied in claim 10, said main compensating devicecomprising a relatively long tapered bar, a fulcrum member having meansto engage the angular edge of said bar, said bar being movable by theaction of said actuator, ant said auxiliary compensating devicecomprising a relatively short tapered bar inserted like a wedge betweensaid relatively long bar and said engaging means, said relatively shortbar having means to limit the movement thereof, whereby the movement ofsaid auxiliary compensating device is less than the movement of saidrelatively long bar.

lll. A structure as specified in claim 10, said main compensating devicecomprising a movable member and means subject to control by movement ofsaid member to govern the action ot said mechanism, and said auxiliarydevice comprising means interposed to change the eliect oit the movementof said member, so that the main compensating device and the auxiliarycompensating device co-operate to produce a result different from thatwhich the main compensating device would be capable of producing alone.

TWILLIAM D. DREISKE.

